Because fast_cached_network_image 1.2.0 depends on uuid ^3.0.7 and no versions of fast_cached_network_image match >1.2.0 <2.0.0, fast_cached_network_image ^1.2.0 requires uuid ^3.0.7.
So, because xxx depends on both fast_cached_network_image ^1.2.0 and uuid ^4.0.3, version solving failed.
Because fast_cached_network_image 1.2.0 depends on uuid ^3.0.7 and no versions of fast_cached_network_image match >1.2.0 <2.0.0, fast_cached_network_image ^1.2.0 requires uuid ^3.0.7. So, because xxx depends on both fast_cached_network_image ^1.2.0 and uuid ^4.0.3, version solving failed.